求经典算法，多多指教

Question

求算一字符串中独立字符的个数。
如string str="jsffff";
其中 
j,1
s,1
f,4

Answer 1

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;
namespace 字符统计
{
    class Program
    {
        static void Main(string[] args)
        {
            string myString =  "uhifhiohskljhdsafipo喔喔 哈哈 你好啊";
            Dictionary<char, int> myDictionary = MyMethod.GetInfoFormString(myString);
            foreach(KeyValuePair<char,int> kvp in myDictionary)
            {
                Console.WriteLine("Key = {0}, Value = {1}",
                    kvp.Key, kvp.Value);
            }           
            
        }    }
    public static class MyMethod
    {
        public static Queue<char> GetOnlyCharFromString(string str)
        {
            Queue<char> myQueue = new Queue<char>();
            for (int i = 0; i < str.Length; i++)
            {
                if (myQueue.Contains(str[i]) == false)
                    myQueue.Enqueue(str[i]);
            }
            return myQueue;
        }
        public static Dictionary<char,int> GetInfoFormString(string str)
        {
            Queue<char> myQueue = GetOnlyCharFromString(str );
            Dictionary<char,int> myDictionary=new Dictionary<char,int>();
            int oldQueueCount = myQueue.Count;//记录下它原有的量;
            for(int i=0;i<oldQueueCount ;i++)
            {
                char myChar=myQueue.Dequeue();
                int num=0;
                for(int j=0;j<str.Length;j++)
                {
                    if(str[j]==myChar)
                        num++;
                }
                myDictionary.Add(myChar,num);
            }
            return myDictionary;
        }    }}